Not sure what of the internals you can use - but if you go with dropping the 16 in, I wonder if you'll be happy with the power. What deck size do you run? If you have a 48" deck I'm not sure you'd want to run with less than 18 HP. Just my thoughts on it, maybe someonwe with a lower HP in this series will comment.
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1864 w/48" deck, 2084 w/54" deck + 54" blade, 3204 w/48" deck
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